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Is it possible to ping a server from Javascript?

...ther parts of the source but you get the idea). function Pinger_ping(ip, callback) { if(!this.inUse) { this.inUse = true; this.callback = callback this.ip = ip; var _that = this; this.img = new Image(); this.img.onload = function() {_that.good();}; this.img.onerro...
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Why does ++[[]][+[]]+[+[]] return the string “10”?

...array ([]). Due to references it's wrong to say [[]][0] === [], but let's call the inner array A to avoid the wrong notation. ++ before its operand means “increment by one and return the incremented result”. So ++[[]][0] is equivalent to Number(A) + 1 (or +A + 1). Again, we can simplify the me...
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【解决】scrapyd启动job时报错:exceptions.TypeError: __init__() got an ...

【解决】scrapyd启动job时报错:exceptions.TypeError: __init__() got an unexpected keyword argument '_job'进入项目spiders目录, 修改 spider py 文件(你自己的spider的主文件):def __init__(self):改为:def __init__(self, *args, **kwargs):最后不要忘了重新部署一...
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Are nested try/except blocks in python a good programming practice?

...EAFP. Personally, I prefer to avoid nesting when it's not necessary: def __getattribute__(self, item): try: return object.__getattribute__(item) except AttributeError: pass # fallback to dict try: return self.dict[item] except KeyError: raise Attrib...
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Pandas percentage of total with groupby

... is a table of some kind, so 100 * x doesn't intuitively make sense (especially when some of the cells contain strings like AZ, ...). – dhardy Feb 6 '15 at 9:42 6 ...
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Read only file system on Android

... Not all phones and versions of android have things mounted the same. Limiting options when remounting would be best. Simply remount as rw (Read/Write): # mount -o rw,remount /system Once you are done making changes, remount t...
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编译器内部的秘密--微软的编译器是如何解析Try/Catch/Throw的 - C/C++ - 清...

...这并不是应该由编译器该干的活。这行语句会变成对函数_CxxThrowException (函数来自MSVCR100.dll或其他类似版本的dll)的调用。 这个函数有编译器内部构建。你喜欢的话,你可以自己调用它。这个函数的第一个参数是指向抛出的异常...
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编译器内部的秘密--微软的编译器是如何解析Try/Catch/Throw的 - C/C++ - 清...

...这并不是应该由编译器该干的活。这行语句会变成对函数_CxxThrowException (函数来自MSVCR100.dll或其他类似版本的dll)的调用。 这个函数有编译器内部构建。你喜欢的话,你可以自己调用它。这个函数的第一个参数是指向抛出的异常...
https://www.tsingfun.com/html/... 

编译器内部的秘密--微软的编译器是如何解析Try/Catch/Throw的 - C/C++ - 清...

...这并不是应该由编译器该干的活。这行语句会变成对函数_CxxThrowException (函数来自MSVCR100.dll或其他类似版本的dll)的调用。 这个函数有编译器内部构建。你喜欢的话,你可以自己调用它。这个函数的第一个参数是指向抛出的异常...
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编译器内部的秘密--微软的编译器是如何解析Try/Catch/Throw的 - C/C++ - 清...

...这并不是应该由编译器该干的活。这行语句会变成对函数_CxxThrowException (函数来自MSVCR100.dll或其他类似版本的dll)的调用。 这个函数有编译器内部构建。你喜欢的话,你可以自己调用它。这个函数的第一个参数是指向抛出的异常...